FBI releases video of 'delusional' Navy Yard shooter

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Aaron Alexis enters Building #197 at 8:08 a.m., carrying a backpack, in this undated handout photo released by the FBI. Over the course of an hour-long shooting incident at the Washington Navy Yard in Washington, DC on September 16, 2013, Aaron Alexis killed 12 people and wounded four others before he was shot and killed by law enforcement officers. REUTERS/FBI/Handout via Reuters